Method for using sludge floccules decomposed by alkaline substances to promote slurry forming of sludge and coal-water slurry

Abstract

The invention discloses a method for using sludge floccules decomposed by alkaline substances to promote slurry forming of sludge and coal-water slurry. The method comprises the following steps: (1) firstly, adding the alkaline substances to sludge, and fully stirring for a certain time to obtain alkali-decomposed sludge; (2) crushing, grinding and sieving raw coal sequentially to obtain pulverized coal having a particle size of smaller than 150 microns; and (3) fully dissolving a slurry preparing additive in water to obtain an additive solution, adding the alkali-decomposed sludge in the step (1) and the pulverized coal in the step (2) to the additive solution, and fully stirring by a slurry preparing and stirring device to obtain uniform sludge and coal-water slurry; or, directly doping the alkali-decomposed sludge in the step (1) into a finished product of coal-water slurry, and fully stirring to obtain the uniform sludge and coal-water slurry. Compared with the prior art, the method provided by the invention has advantages of low cost and convenient operation, and can effectively reduce slurry forming viscosity of the sludge and coal-water slurry, improve a slurry forming concentration, acquire the sludge and coal-water slurry with excellent slurry forming performance, and being suitable for large-scale promotion and application.

Description

technical field

[0001] The invention relates to a method of using alkaline substances to decompose sludge flocs to promote the formation of sludge coal-water slurry, specifically involves firstly using alkaline substances to decompose and modify the sludge, weaken the connection between sludge particles, and release Part of the interstitial water, and then mix the sludge after alkali hydrolysis with coal, pulping additives, water, etc. to prepare sludge coal-water slurry, or mix the cracked sludge into finished coal-water slurry, and stir evenly to make sludge Coal water slurry is a technical method that uses alkaline substances to degrade sludge flocs and their extracellular polymers to promote the formation of sludge coal water slurry. Background technique

[0002] With the continuous development of my country's social economy and urbanization, the generation of urban sewage continues to increase. In recent years, my country's sewage treatment industry has developed rapid...

Examples

Embodiment approach

[0029] The sludge is taken from the mechanically dewatered sludge produced by a sewage treatment plant, with a moisture content of 80.76%, which is used for alkaline hydrolysis modification and subsequent sludge coal-water slurry production.

[0030] CaO powder is selected as the alkaline substance, and its dosage is respectively 0 (that is, original sludge), 1%, 2%, 3% and 4% of the sludge mass (converted according to the moisture content of 80%), and it is fully stirred for 20 minutes to ensure that the CaO powder Mix well with the sludge, and store the well-stirred sludge in a sealed plastic bottle to avoid loss of moisture. Alkaline hydrolysis time was 0 day (ie original sludge), 1 day and 3 days.

[0031] When making coal-water slurry from alkaline hydrolysis sludge, the mass ratio relationship of each raw material component is: sludge: dry coal powder = 15:100, additive: dry coal powder = 0.8:100 converted according to the moisture content of 80%. The additive is sodium...

Embodiment 2

[0039] (1) Implementation method

[0040] The sludge is taken from the mechanically dewatered sludge produced by a sewage treatment plant, with a moisture content of 82.42%, which is used for alkaline hydrolysis modification and subsequent sludge coal-water slurry production.

[0041] Alkaline substances choose NaOH and Ca(OH) 2, its dosage is 2% and 4% of the sludge mass (converted by 80% water content), fully stirred for 20 minutes, to ensure that the alkaline substance is mixed evenly with the sludge, and the uniformly stirred sludge is stored in a sealed plastic bottle. So as not to lose water, after 1 day (ie 24h) of treatment, alkali hydrolysis sludge was obtained. .

[0042] When making coal-water slurry from alkaline hydrolysis sludge, the mass ratio relationship of each raw material component is: sludge: dry coal powder = 15:100, additive: dry coal powder = 0.8:100 converted according to the moisture content of 80%. The additive is lignosulfonate. The solid mass c...

Embodiment 3

[0046] (1) Implementation method

[0047] The sludge is taken from the mechanically dewatered sludge produced by a sewage treatment plant, with a moisture content of 82.42%, which is used for alkaline hydrolysis modification and subsequent sludge coal-water slurry production.

[0048] Alkaline substances choose NaOH and Ca(OH) 2 , the dosage is 2% of the sludge mass (converted according to the moisture content of 80%), fully stirred for 20 minutes to ensure that the alkaline substance and the sludge are evenly mixed, and the evenly stirred sludge is stored in a sealed plastic bottle to avoid loss of moisture , After 1 day of treatment (ie 24h), the alkali hydrolysis sludge was obtained.

[0049] The coal-water slurry adopts the finished product prepared in advance, and the additive is naphthalenesulfonate formaldehyde condensate when making the coal-water slurry, and the mass ratio relationship between the additive and the dry coal powder is 0.8:100.

[0050] The alkali hydr...

technical field

[0001] The invention relates to a method of using alkaline substances to decompose sludge flocs to promote the formation of sludge coal-water slurry, specifically involves firstly using alkaline substances to decompose and modify the sludge, weaken the connection between sludge particles, and release Part of the interstitial water, and then mix the sludge after alkali hydrolysis with coal, pulping additives, water, etc. to prepare sludge coal-water slurry, or mix the cracked sludge into finished coal-water slurry, and stir evenly to make sludge Coal water slurry is a technical method that uses alkaline substances to degrade sludge flocs and their extracellular polymers to promote the formation of sludge coal water slurry. Background technique

[0002] With the continuous development of my country's social economy and urbanization, the generation of urban sewage continues to increase. In recent years, my country's sewage treatment industry has developed rapid...

Examples

Embodiment approach

[0029] The sludge is taken from the mechanically dewatered sludge produced by a sewage treatment plant, with a moisture content of 80.76%, which is used for alkaline hydrolysis modification and subsequent sludge coal-water slurry production.

[0030] CaO powder is selected as the alkaline substance, and its dosage is respectively 0 (that is, original sludge), 1%, 2%, 3% and 4% of the sludge mass (converted according to the moisture content of 80%), and it is fully stirred for 20 minutes to ensure that the CaO powder Mix well with the sludge, and store the well-stirred sludge in a sealed plastic bottle to avoid loss of moisture. Alkaline hydrolysis time was 0 day (ie original sludge), 1 day and 3 days.

[0031] When making coal-water slurry from alkaline hydrolysis sludge, the mass ratio relationship of each raw material component is: sludge: dry coal powder = 15:100, additive: dry coal powder = 0.8:100 converted according to the moisture content of 80%. The additive is sodium...

Embodiment 2

[0039] (1) Implementation method

[0040] The sludge is taken from the mechanically dewatered sludge produced by a sewage treatment plant, with a moisture content of 82.42%, which is used for alkaline hydrolysis modification and subsequent sludge coal-water slurry production.

[0041] Alkaline substances choose NaOH and Ca(OH) 2, its dosage is 2% and 4% of the sludge mass (converted by 80% water content), fully stirred for 20 minutes, to ensure that the alkaline substance is mixed evenly with the sludge, and the uniformly stirred sludge is stored in a sealed plastic bottle. So as not to lose water, after 1 day (ie 24h) of treatment, alkali hydrolysis sludge was obtained. .

[0042] When making coal-water slurry from alkaline hydrolysis sludge, the mass ratio relationship of each raw material component is: sludge: dry coal powder = 15:100, additive: dry coal powder = 0.8:100 converted according to the moisture content of 80%. The additive is lignosulfonate. The solid mass c...

Embodiment 3

[0046] (1) Implementation method

[0047] The sludge is taken from the mechanically dewatered sludge produced by a sewage treatment plant, with a moisture content of 82.42%, which is used for alkaline hydrolysis modification and subsequent sludge coal-water slurry production.

[0048] Alkaline substances choose NaOH and Ca(OH) 2 , the dosage is 2% of the sludge mass (converted according to the moisture content of 80%), fully stirred for 20 minutes to ensure that the alkaline substance and the sludge are evenly mixed, and the evenly stirred sludge is stored in a sealed plastic bottle to avoid loss of moisture , After 1 day of treatment (ie 24h), the alkali hydrolysis sludge was obtained.

[0049] The coal-water slurry adopts the finished product prepared in advance, and the additive is naphthalenesulfonate formaldehyde condensate when making the coal-water slurry, and the mass ratio relationship between the additive and the dry coal powder is 0.8:100.

[0050] The alkali hydr...

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